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I don't drive a impreza but a 03 Baja... Hope yall can help me figure out whats wrong with my truck.

Two weeks ago my car got into serious jam. Took in water after driving through a foot and half high flood and an 18 wheeler drove past me so fast pushing water over my hood and the intake sucked in a lot water.

After 2 days of drying and cleaning. Car came back alive.... BUT began acting funny. Battery dying quick. Tested stock alternator and turn out to be bad and replaced it.

Seemed to work better BUT still experiencing random problem like I cant start it and had to have it jumped. Dashboard info (trip and clock) would reset to zero/random time. Headlights seem to struggle to have full power. Just like flashlight on weak battery.

Took it to Advance Auto and have them test it.... Everything passed including my battery.

Lately I've been unplugging gps from the 12v adapter... turning off head light (Including hand brake for DLR) before turning off the engine... Disabled celling light... So I wont have to ask around for jumps again...

Sorry to hear about that. The car may never be the same as before going through the water sorry to say.

You may have to go over most of the electrical connections under the hood at least and clean them. Check the main fuse panel under the hood for and signs of corrosion. Hopefully that will fix the wiring up but it may not. You might have to replace the main wire harness for the engine later on.

I would unplug every connector I can find and write them down in a log book. Let them air out for a few days and re-connect everything. I would also swap out the battery regardless. A lot of times those battery testers do not diagnose a bad cell.

Pull the carpet up and check the ECU for wetness. Also scan the ECU with an OBDII reader and see if any CEL codes are pending.

With the car off, use an ammeter and pull your fuses. Go to each fuse holder and complete the circuit with the meter leads. Check for excess current. If you find something post the fuse number here and at least that may narrow down the short to a small group of sensors.

Wow Hydrolock seem scary (Never heard of it until today and googled it)... Now that you mention it.. I feel something new I never felt before. When I drive normally no problem.. But when I try to accelerate quickly I would feel deep rumble almost as if I have an nice aftermarket exhaust which I don't. Everything on the car is stock.

As for ECU... No water got into the car. The door seal did it's job.

No water got into the fuse box.
No codes are appearing on OBDII scanner.
No warning indicator on dashboard appearing.

I'll check each fuse when the god forsaken rain stop pouring... (I live in east coast)